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Graphing Calculator

Plot mathematical functions right in your browser. Type a function like x^2 or sin(x), add more to compare them, and drag or zoom to explore the graph.

y =

Drag to pan, use + and − to zoom.

Formula

y = f(x)

How it works

A graph shows, for every x value, the matching y value. The calculator evaluates f(x) for each pixel column and connects the points. For functions with an asymptote, such as 1/x, the line is broken rather than drawn through — so you can see the discontinuity.

Step by step

  1. 1Type a function after "y =", for example x^2 or sin(x).
  2. 2Click "Add function" to compare a second graph.
  3. 3Drag the graph to pan and use + and − to zoom.
  4. 4Click "Reset" to return to the default range.

Worked examples

Plotting a parabola

→ Type x^2 — you get an upward parabola with its vertex at (0,0).

Comparing two functions

→ Type x^2 and 2x: they intersect at x = 0 and x = 2.

A sine wave

→ Type sin(x) and zoom out to see several periods.

Common mistakes

  • Writing x² instead of x^2. Use the caret for powers.
  • Forgetting parentheses with functions: write sin(x), not sin x.
  • Expecting 1/x to be one continuous line. The function is undefined at x = 0.

When to use it

  • Secondary-school maths: understanding functions, parabolas and asymptotes.
  • Visually finding intersections and roots of functions.
  • Checking homework without a physical graphing calculator.

Frequently asked questions

What is a graphing calculator?

A graphing calculator draws mathematical functions as a graph, so you can see their shape, intersections and roots instead of just individual numbers.

Is this graphing calculator free?

Yes. It runs entirely in your browser, is free, and requires no account or installation.

Which functions can I plot?

Powers (x^2), roots (sqrt(x)), trigonometry (sin, cos, tan), logarithms (log, ln), absolute value, and combinations of these with + − × ÷ and parentheses.

Does this replace a Casio or TI-84?

For exploring and understanding functions, yes. For exams you usually need an approved physical calculator, such as a Casio fx-82 or TI-84.